Solubility product of Pu(VI) hydrous oxide
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Kenso Fujiwara
Abstract
The solubility of Pu(VI) hydrous oxide was measured in the pHc range from 4 to 5.5 at 25±1°C in a NaClO4 solution containing O3 gas. The experiment was carried out by oversaturation and undersaturation methods at ionic strength I=0.1, 0.5 and 1.0. The concentration of Pu(VI) was measured by α-spectrometry and UV/visible spectrophotometry, and the equilibrium constant of the reaction, PuO2(OH)2=PuO22+ + 2 OH-, was obtained. From the obtained results, the solubility products (Ksp) of Pu hydrous oxide at I=0.1, 0.5 and 1.0 were determined. The experimental values were extrapolated to the standard state (I=0) by using the specific interaction theory (SIT), and the solubility product of Pu hydrous oxide was determined to be log Ksp°=-22.88±0.39. The ion interaction coefficient (PuO22+, ClO4-) was also evaluated to be 0.30±0.09.
© 2003 Oldenbourg Wissenschaftsverlag GmbH
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Artikel in diesem Heft
- Some rules to improve the energy resolution in alpha liquid scintillation with beta rejection
- Confidence intervals for experiments with background and small numbers of events
- Solubility product of Pu(VI) hydrous oxide
- Precipitation of crystalline neptunium dioxide from near-neutral aqueous solution
- Stability of U(VI) solid phases in the U(VI)-Ca2+-SiO2-OH system
- Synergistic extraction of Th(IV) by 2-hydroxy-1-naphthaldehyde thiosemicarbazone and neutral donors
- Production of 55Co via the 54Fe(d,n)-process and excitation functions of 54Fe(d,t)53Fe and 54Fe(d,α)52mMn reactions from threshold up to 13.8 MeV
- Potential in vivo generator for alpha-particle therapy with 212Bi: Presentation of a system to minimize escape of daughter nuclide after decay of 212Pb to 212Bi
- In vitro study of the interaction between neptunium ions and aposerumtransferrin by absorption spectrophotometry and ultrafiltration: the case of Np(V)
